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<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="core.noinit_adaptor"></a><a class="link" href="noinit_adaptor.html" title="noinit_adaptor">noinit_adaptor</a>
</h2></div></div></div>
<div class="toc"><dl class="toc">
<dt><span class="section"><a href="noinit_adaptor.html#core.noinit_adaptor.overview">Overview</a></span></dt>
<dt><span class="section"><a href="noinit_adaptor.html#core.noinit_adaptor.examples">Examples</a></span></dt>
<dt><span class="section"><a href="noinit_adaptor.html#core.noinit_adaptor.reference">Reference</a></span></dt>
</dl></div>
<div class="simplesect">
<div class="titlepage"><div><div><h3 class="title">
<a name="idm8626"></a>Authors</h3></div></div></div>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
          Glen Fernandes
        </li></ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="core.noinit_adaptor.overview"></a><a class="link" href="noinit_adaptor.html#core.noinit_adaptor.overview" title="Overview">Overview</a>
</h3></div></div></div>
<p>
        The header &lt;boost/core/noinit_adaptor.hpp&gt; provides the class template
        <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">noinit_adaptor</span></code> that converts any allocator
        into one whose <code class="computeroutput"><span class="identifier">construct</span><span class="special">(</span><span class="identifier">ptr</span><span class="special">)</span></code>
        performs default initialization via placement new, and whose <code class="computeroutput"><span class="identifier">destroy</span><span class="special">(</span><span class="identifier">ptr</span><span class="special">)</span></code> invokes
        <code class="computeroutput"><span class="identifier">value_type</span></code> destructor directly.
      </p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="core.noinit_adaptor.examples"></a><a class="link" href="noinit_adaptor.html#core.noinit_adaptor.examples" title="Examples">Examples</a>
</h3></div></div></div>
<p>
        The following example shows use of this allocator adaptor to achieve default
        initialization of elements of a trivial type, which are later assigned values.
      </p>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">core</span><span class="special">/</span><span class="identifier">noinit_adaptor</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">numeric</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">vector</span><span class="special">&gt;</span>

<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
<span class="special">{</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">noinit_adaptor</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">allocator</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="special">&gt;</span> <span class="special">&gt;</span> <span class="identifier">v</span><span class="special">(</span><span class="number">5</span><span class="special">);</span>
    <span class="identifier">std</span><span class="special">::</span><span class="identifier">iota</span><span class="special">(</span><span class="identifier">v</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">v</span><span class="special">.</span><span class="identifier">end</span><span class="special">(),</span> <span class="number">1</span><span class="special">);</span>
<span class="special">}</span>
</pre>
<p>
        The <code class="computeroutput"><span class="identifier">allocate_shared_noinit</span></code>
        function templates are now implemented simply using <code class="computeroutput"><span class="identifier">allocate_shared</span></code>
        with <code class="computeroutput"><span class="identifier">noinit_adaptor</span></code>.
      </p>
<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">A</span><span class="special">&gt;</span>
<span class="identifier">enable_if_t</span><span class="special">&lt;</span><span class="identifier">is_unbounded_array_v</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;,</span> <span class="identifier">shared_ptr</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;</span> <span class="special">&gt;</span>
<span class="identifier">allocate_shared_noinit</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">A</span><span class="special">&amp;</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">size_t</span> <span class="identifier">n</span><span class="special">)</span>
<span class="special">{</span>
    <span class="keyword">return</span> <span class="identifier">allocate_shared</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">noinit_adapt</span><span class="special">(</span><span class="identifier">a</span><span class="special">),</span> <span class="identifier">n</span><span class="special">);</span>
<span class="special">}</span>

<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">A</span><span class="special">&gt;</span>
<span class="identifier">enable_if_t</span><span class="special">&lt;!</span><span class="identifier">is_unbounded_array_v</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;,</span> <span class="identifier">shared_ptr</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;</span> <span class="special">&gt;</span>
<span class="identifier">allocate_shared_noinit</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">A</span><span class="special">&amp;</span> <span class="identifier">a</span><span class="special">)</span>
<span class="special">{</span>
    <span class="keyword">return</span> <span class="identifier">allocate_shared</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">noinit_adapt</span><span class="special">(</span><span class="identifier">a</span><span class="special">));</span>
<span class="special">}</span>
</pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="core.noinit_adaptor.reference"></a><a class="link" href="noinit_adaptor.html#core.noinit_adaptor.reference" title="Reference">Reference</a>
</h3></div></div></div>
<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span>

<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">A</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">noinit_adaptor</span>
    <span class="special">:</span> <span class="identifier">A</span> <span class="special">{</span>
    <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">U</span><span class="special">&gt;</span>
    <span class="keyword">struct</span> <span class="identifier">rebind</span> <span class="special">{</span>
        <span class="keyword">typedef</span> <span class="identifier">noinit_adaptor</span><span class="special">&lt;</span><span class="identifier">allocator_rebind_t</span><span class="special">&lt;</span><span class="identifier">A</span><span class="special">,</span> <span class="identifier">U</span><span class="special">&gt;</span> <span class="special">&gt;</span> <span class="identifier">other</span><span class="special">;</span>
    <span class="special">};</span>

    <span class="identifier">noinit_adaptor</span><span class="special">()</span> <span class="keyword">noexcept</span><span class="special">;</span>

    <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">U</span><span class="special">&gt;</span>
    <span class="identifier">noinit_adaptor</span><span class="special">(</span><span class="identifier">U</span><span class="special">&amp;&amp;</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>

    <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">U</span><span class="special">&gt;</span>
    <span class="identifier">noinit_adaptor</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">noinit_adaptor</span><span class="special">&lt;</span><span class="identifier">U</span><span class="special">&gt;&amp;</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>

    <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">U</span><span class="special">&gt;</span>
    <span class="keyword">void</span> <span class="identifier">construct</span><span class="special">(</span><span class="identifier">U</span><span class="special">*</span> <span class="identifier">p</span><span class="special">);</span>

    <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">U</span><span class="special">&gt;</span>
    <span class="keyword">void</span> <span class="identifier">destroy</span><span class="special">(</span><span class="identifier">U</span><span class="special">*</span> <span class="identifier">p</span><span class="special">);</span>
<span class="special">};</span>

<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">U</span><span class="special">&gt;</span>
<span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">==(</span><span class="keyword">const</span> <span class="identifier">noinit_adaptor</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
    <span class="keyword">const</span> <span class="identifier">noinit_adaptor</span><span class="special">&lt;</span><span class="identifier">U</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>

<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">U</span><span class="special">&gt;</span>
<span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">!=(</span><span class="keyword">const</span> <span class="identifier">noinit_adaptor</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span>
    <span class="keyword">const</span> <span class="identifier">noinit_adaptor</span><span class="special">&lt;</span><span class="identifier">U</span><span class="special">&gt;&amp;</span> <span class="identifier">rhs</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>

<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">A</span><span class="special">&gt;</span>
<span class="identifier">noinit_adaptor</span><span class="special">&lt;</span><span class="identifier">A</span><span class="special">&gt;</span> <span class="identifier">noinit_adapt</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">A</span><span class="special">&amp;</span> <span class="identifier">a</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>

<span class="special">}</span> <span class="comment">/* boost */</span>
</pre>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="core.noinit_adaptor.reference.constructors"></a><a class="link" href="noinit_adaptor.html#core.noinit_adaptor.reference.constructors" title="Constructors">Constructors</a>
</h4></div></div></div>
<div class="variablelist">
<p class="title"><b></b></p>
<dl class="variablelist">
<dt><span class="term"><code class="computeroutput"><span class="identifier">noinit_adaptor</span><span class="special">()</span> <span class="keyword">noexcept</span><span class="special">;</span></code></span></dt>
<dd><div class="variablelist">
<p class="title"><b></b></p>
<dl class="variablelist">
<dt><span class="term">Effects</span></dt>
<dd><p>
                      Value initializes the A base class.
                    </p></dd>
</dl>
</div></dd>
<dt><span class="term"><code class="computeroutput"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">U</span><span class="special">&gt;</span> <span class="identifier">noinit_adaptor</span><span class="special">(</span><span class="identifier">U</span><span class="special">&amp;&amp;</span> <span class="identifier">u</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></code></span></dt>
<dd><div class="variablelist">
<p class="title"><b></b></p>
<dl class="variablelist">
<dt><span class="term">Requires</span></dt>
<dd><p>
                      <code class="computeroutput"><span class="identifier">A</span></code> shall be
                      constructible from <code class="computeroutput"><span class="identifier">U</span></code>.
                    </p></dd>
<dt><span class="term">Effects</span></dt>
<dd><p>
                      Initializes the <code class="computeroutput"><span class="identifier">A</span></code>
                      base class with <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">forward</span><span class="special">&lt;</span><span class="identifier">U</span><span class="special">&gt;(</span><span class="identifier">u</span><span class="special">)</span></code>.
                    </p></dd>
</dl>
</div></dd>
<dt><span class="term"><code class="computeroutput"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">U</span><span class="special">&gt;</span> <span class="identifier">noinit_adaptor</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">noinit_adaptor</span><span class="special">&lt;</span><span class="identifier">U</span><span class="special">&gt;&amp;</span>
            <span class="identifier">u</span><span class="special">)</span>
            <span class="keyword">noexcept</span><span class="special">;</span></code></span></dt>
<dd><div class="variablelist">
<p class="title"><b></b></p>
<dl class="variablelist">
<dt><span class="term">Requires</span></dt>
<dd><p>
                      <code class="computeroutput"><span class="identifier">A</span></code> shall be
                      constructible from <code class="computeroutput"><span class="identifier">U</span></code>.
                    </p></dd>
<dt><span class="term">Effects</span></dt>
<dd><p>
                      Initializes the <code class="computeroutput"><span class="identifier">A</span></code>
                      base class with <code class="computeroutput"><span class="keyword">static_cast</span><span class="special">&lt;</span><span class="keyword">const</span>
                      <span class="identifier">A</span><span class="special">&amp;&gt;(</span><span class="identifier">u</span><span class="special">)</span></code>.
                    </p></dd>
</dl>
</div></dd>
</dl>
</div>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="core.noinit_adaptor.reference.member_functions"></a><a class="link" href="noinit_adaptor.html#core.noinit_adaptor.reference.member_functions" title="Member functions">Member
        functions</a>
</h4></div></div></div>
<div class="variablelist">
<p class="title"><b></b></p>
<dl class="variablelist">
<dt><span class="term"><code class="computeroutput"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">U</span><span class="special">&gt;</span> <span class="keyword">void</span> <span class="identifier">construct</span><span class="special">(</span><span class="identifier">U</span><span class="special">*</span> <span class="identifier">p</span><span class="special">);</span></code></span></dt>
<dd><div class="variablelist">
<p class="title"><b></b></p>
<dl class="variablelist">
<dt><span class="term">Effects</span></dt>
<dd><p>
                      <code class="computeroutput"><span class="special">::</span><span class="keyword">new</span><span class="special">((</span><span class="keyword">void</span><span class="special">*)</span><span class="identifier">p</span><span class="special">)</span> <span class="identifier">U</span></code>.
                    </p></dd>
</dl>
</div></dd>
<dt><span class="term"><code class="computeroutput"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">U</span><span class="special">&gt;</span> <span class="keyword">void</span> <span class="identifier">destroy</span><span class="special">(</span><span class="identifier">U</span><span class="special">*</span> <span class="identifier">p</span><span class="special">);</span></code></span></dt>
<dd><div class="variablelist">
<p class="title"><b></b></p>
<dl class="variablelist">
<dt><span class="term">Effects</span></dt>
<dd><p>
                      <code class="computeroutput"><span class="identifier">p</span><span class="special">-&gt;~</span><span class="identifier">U</span><span class="special">()</span></code>.
                    </p></dd>
</dl>
</div></dd>
</dl>
</div>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="core.noinit_adaptor.reference.operators"></a><a class="link" href="noinit_adaptor.html#core.noinit_adaptor.reference.operators" title="Operators">Operators</a>
</h4></div></div></div>
<div class="variablelist">
<p class="title"><b></b></p>
<dl class="variablelist">
<dt><span class="term"><code class="computeroutput"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">U</span><span class="special">&gt;</span> <span class="keyword">constexpr</span> <span class="keyword">bool</span>
            <span class="keyword">operator</span><span class="special">==(</span><span class="keyword">const</span> <span class="identifier">noinit_adaptor</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">noinit_adaptor</span><span class="special">&lt;</span><span class="identifier">U</span><span class="special">&gt;&amp;</span>
            <span class="identifier">rhs</span><span class="special">)</span>
            <span class="keyword">noexcept</span><span class="special">;</span></code></span></dt>
<dd><div class="variablelist">
<p class="title"><b></b></p>
<dl class="variablelist">
<dt><span class="term">Returns</span></dt>
<dd><p>
                      <code class="computeroutput"><span class="keyword">static_cast</span><span class="special">&lt;</span><span class="keyword">const</span> <span class="identifier">T</span><span class="special">&amp;&gt;(</span><span class="identifier">lhs</span><span class="special">)</span> <span class="special">==</span>
                      <span class="keyword">static_cast</span><span class="special">&lt;</span><span class="keyword">const</span> <span class="identifier">U</span><span class="special">&amp;&gt;(</span><span class="identifier">rhs</span><span class="special">)</span></code>.
                    </p></dd>
</dl>
</div></dd>
<dt><span class="term"><code class="computeroutput"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">U</span><span class="special">&gt;</span> <span class="keyword">constexpr</span> <span class="keyword">bool</span>
            <span class="keyword">operator</span><span class="special">!=(</span><span class="keyword">const</span> <span class="identifier">noinit_adaptor</span><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;&amp;</span> <span class="identifier">lhs</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">noinit_adaptor</span><span class="special">&lt;</span><span class="identifier">U</span><span class="special">&gt;&amp;</span>
            <span class="identifier">rhs</span><span class="special">)</span>
            <span class="keyword">noexcept</span><span class="special">;</span></code></span></dt>
<dd><div class="variablelist">
<p class="title"><b></b></p>
<dl class="variablelist">
<dt><span class="term">Returns</span></dt>
<dd><p>
                      <code class="computeroutput"><span class="special">!(</span><span class="identifier">lhs</span>
                      <span class="special">==</span> <span class="identifier">rhs</span><span class="special">)</span></code>.
                    </p></dd>
</dl>
</div></dd>
</dl>
</div>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="core.noinit_adaptor.reference.free_functions"></a><a class="link" href="noinit_adaptor.html#core.noinit_adaptor.reference.free_functions" title="Free functions">Free
        functions</a>
</h4></div></div></div>
<div class="variablelist">
<p class="title"><b></b></p>
<dl class="variablelist">
<dt><span class="term"><code class="computeroutput"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">A</span><span class="special">&gt;</span> <span class="identifier">noinit_adaptor</span><span class="special">&lt;</span><span class="identifier">A</span><span class="special">&gt;</span> <span class="identifier">noinit_adapt</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">A</span><span class="special">&amp;</span> <span class="identifier">a</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></code></span></dt>
<dd><div class="variablelist">
<p class="title"><b></b></p>
<dl class="variablelist">
<dt><span class="term">Returns</span></dt>
<dd><p>
                      <code class="computeroutput"><span class="identifier">noinit_adaptor</span><span class="special">&lt;</span><span class="identifier">A</span><span class="special">&gt;(</span><span class="identifier">a</span><span class="special">)</span></code>.
                    </p></dd>
</dl>
</div></dd>
</dl>
</div>
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<td align="right"><div class="copyright-footer">Copyright © 2014 Peter Dimov<br>Copyright © 2014 Glen Fernandes<br>Copyright © 2014 Andrey Semashev<p>
        Distributed under the <a href="http://boost.org/LICENSE_1_0.txt" target="_top">Boost
        Software License, Version 1.0</a>.
      </p>
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